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188 lines
6.5 KiB
HTML
188 lines
6.5 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html lang="en">
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<head>
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<meta http-equiv="content-type" content="text/html; charset=utf-8">
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<title>Compilation and Installation using Meson</title>
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<link rel="stylesheet" type="text/css" href="mesa.css">
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</head>
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<body>
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<div class="header">
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<h1>The Mesa 3D Graphics Library</h1>
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</div>
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<iframe src="contents.html"></iframe>
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<div class="content">
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<h1>Compilation and Installation using Meson</h1>
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<h2 id="basic">1. Basic Usage</h2>
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<p><strong>The Meson build system is generally considered stable and ready
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for production</strong></p>
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<p>The meson build is tested on on Linux, macOS, Cygwin and Haiku, it should
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work on FreeBSD, DragonflyBSD, NetBSD, and OpenBSD.</p>
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<p><strong>Mesa requires Meson >= 0.44.1 to build.</strong>
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Some older versions of meson do not check that they are too old and will error
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out in odd ways.
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</p>
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<p>
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The meson program is used to configure the source directory and generates
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either a ninja build file or Visual Studio® build files. The latter must
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be enabled via the <code>--backend</code> switch, as ninja is the default backend on all
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operating systems. Meson only supports out-of-tree builds, and must be passed a
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directory to put built and generated sources into. We'll call that directory
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"build" for examples.
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</p>
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<pre>
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meson build/
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</pre>
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<p>
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To see a description of your options you can run <code>meson configure</code>
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along with a build directory to view the selected options for. This will show
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your meson global arguments and project arguments, along with their defaults
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and your local settings.
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Meson does not currently support listing options before configure a build
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directory, but this feature is being discussed upstream.
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</p>
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<pre>
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meson configure build/
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</pre>
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<p>
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With additional arguments <code>meson configure</code> is used to change
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options on already configured build directory. All options passed to this
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command are in the form <code>-D "command"="value"</code>.
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</p>
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<pre>
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meson configure build/ -Dprefix=/tmp/install -Dglx=true
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</pre>
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<p>
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Note that options taking lists (such as <code>platforms</code>) are
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<a href="http://mesonbuild.com/Build-options.html#using-build-options">a bit
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more complicated</a>, but the simplest form compatible with Mesa options
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is to use a comma to separate values (<code>-D platforms=drm,wayland</code>)
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and brackets to represent an empty list (<code>-D platforms=[]</code>).
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</p>
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<p>
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Once you've run the initial <code>meson</code> command successfully you can use
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your configured backend to build the project. With ninja, the -C option can be
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be used to point at a directory to build.
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</p>
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<pre>
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ninja -C build/
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</pre>
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<p>
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Without arguments, it will produce libGL.so and/or several other libraries
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depending on the options you have chosen. Later, if you want to rebuild for a
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different configuration, you should run <code>ninja clean</code> before
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changing the configuration, or create a new out of tree build directory for
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each configuration you want to build
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<a href="http://mesonbuild.com/Using-multiple-build-directories.html">as
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recommended in the documentation</a>
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</p>
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<dl>
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<dt><code>Environment Variables</code></dt>
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<dd><p>Meson supports the standard CC and CXX environment variables for
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changing the default compiler, and CFLAGS, CXXFLAGS, and LDFLAGS for setting
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options to the compiler and linker.
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The default compilers depends on your operating system. Meson supports most of
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the popular compilers, a complete list is available
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<a href="http://mesonbuild.com/Reference-tables.html#compiler-ids">here</a>.
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These arguments are consumed and stored by meson when it is initialized or
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re-initialized. Therefore passing them to meson configure will not do anything,
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and passing them to ninja will only do something if ninja decides to
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re-initialize meson, for example, if a meson.build file has been changed.
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Changing these variables will not cause all targets to be rebuilt, so running
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ninja clean is recommended when changing CFLAGS or CXXFLAGS. Meson will never
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change compiler in a configured build directory.
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</p>
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<pre>
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CC=clang CXX=clang++ meson build-clang
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ninja -C build-clang
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ninja -C build-clang clean
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touch meson.build
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CFLAGS=-Wno-typedef-redefinition ninja -C build-clang
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</pre>
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<p>Meson also honors <code>DESTDIR</code> for installs</p>
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</dd>
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<dt><code>LLVM</code></dt>
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<dd><p>Meson includes upstream logic to wrap llvm-config using it's standard
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dependency interface. It will search <code>$PATH</code> (or <code>%PATH%</code> on windows) for
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llvm-config, so using an LLVM from a non-standard path is as easy as
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<code>PATH=/path/with/llvm-config:$PATH meson build</code>.
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</p></dd>
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</dl>
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<dl>
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<dt><code>PKG_CONFIG_PATH</code></dt>
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<dd><p>The
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<code>pkg-config</code> utility is a hard requirement for configuring and
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building Mesa on Unix-like systems. It is used to search for external libraries
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on the system. This environment variable is used to control the search path for
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<code>pkg-config</code>. For instance, setting
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<code>PKG_CONFIG_PATH=/usr/X11R6/lib/pkgconfig</code> will search for package
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metadata in <code>/usr/X11R6</code> before the standard directories.</p>
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</dd>
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</dl>
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<p>
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One of the oddities of meson is that some options are different when passed to
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the <code>meson</code> than to <code>meson configure</code>. These options are
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passed as --option=foo to <code>meson</code>, but -Doption=foo to <code>meson
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configure</code>. Mesa defined options are always passed as -Doption=foo.
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</p>
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<p>For those coming from autotools be aware of the following:</p>
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<dl>
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<dt><code>--buildtype/-Dbuildtype</code></dt>
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<dd><p>This option will set the compiler debug/optimisation levels to aid
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debugging the Mesa libraries.</p>
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<p>Note that in meson this defaults to <code>debugoptimized</code>, and
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not setting it to <code>release</code> will yield non-optimal
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performance and binary size. Not using <code>debug</code> may interfere
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with debugging as some code and validation will be optimized away.
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</p>
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<p> For those wishing to pass their own optimization flags, use the <code>plain</code>
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buildtype, which causes meson to inject no additional compiler arguments, only
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those in the C/CXXFLAGS and those that mesa itself defines.</p>
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</dd>
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</dl>
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<dl>
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<dt><code>-Db_ndebug</code></dt>
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<dd><p>This option controls assertions in meson projects. When set to <code>false</code>
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(the default) assertions are enabled, when set to true they are disabled. This
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is unrelated to the <code>buildtype</code>; setting the latter to
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<code>release</code> will not turn off assertions.
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</p>
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</dd>
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</dl>
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</div>
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</body>
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</html>
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